Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-271739-index-headers.html | 2020-10-19 09:23:02 | |
| 0001193125-20-271739-index.html | 2020-10-19 09:23:02 | |
| 0001193125-20-271739.txt | 2020-10-19 09:23:02 | |
 0001193125-20-271739-xbrl.zip | 113924 | 2020-10-19 09:23:02 |
| bstc-20201019.xsd | 3070 | 2020-10-19 09:23:02 |
| bstc-20201019_lab.xml | 18139 | 2020-10-19 09:23:02 |
| bstc-20201019_pre.xml | 11408 | 2020-10-19 09:23:02 |
| d79654d8k.htm | 51866 | 2020-10-19 09:23:02 |
| d79654d8k_htm.xml | 3421 | 2020-10-19 09:23:02 |
| d79654dex21.htm | 537427 | 2020-10-19 09:23:02 |
| d79654dex41.htm | 25983 | 2020-10-19 09:23:02 |
| d79654dex991.htm | 15580 | 2020-10-19 09:23:02 |
| FilingSummary.xml | 1789 | 2020-10-19 09:23:02 |
| Financial_Report.xlsx | 5491 | 2020-10-19 09:23:02 |
 g79654g1018023233819.jpg | 8440 | 2020-10-19 09:23:02 |
| MetaLinks.json | 18860 | 2020-10-19 09:23:02 |
| R1.htm | 40186 | 2020-10-19 09:23:02 |
| report.css | 2767 | 2020-10-19 09:23:02 |
| Show.js | 1085 | 2020-10-19 09:23:02 |